Samarium
62
Sm
Ryhmä
Ei saatavilla
Jakso
6
Lohko
f
Protonia
Elektronit
Neutronia
62
62
88
Yleiset ominaisuudet
Järjestysluku
62
Atomipaino
150,36
Massaluku
150
Luokka
Lantanoidit
Väri
Hopea
Radioaktiivisuus
Ei
From samarskite, a mineral named after Russian mine official, Col. Samarski
Kiderakenne
Yksinkertainen trigoninen
Historia
In 1853, Jean Charles Galissard de Marignac discovered samarium when he found lines in mineral spectra.
Paul Émile Lecoq de Boisbaudran isolated a samarium salt in Paris in 1879 from the mineral samarskite and identified a new element in it via sharp optical absorption lines.
The pure element was produced only in 1901 by Eugène-Anatole Demarçay.
Paul Émile Lecoq de Boisbaudran isolated a samarium salt in Paris in 1879 from the mineral samarskite and identified a new element in it via sharp optical absorption lines.
The pure element was produced only in 1901 by Eugène-Anatole Demarçay.
Elektroneja elektronikuorilla
2, 8, 18, 24, 8, 2
Orbitaalirakenne
[Xe] 4f6 6s2
Samarium metal can be produced by reducing the oxide with lanthanum
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
7,52 g/cm3
Sulamispiste
1345,15 K | 1072 °C | 1961,6 °F
Kiehumispiste
2067,15 K | 1794 °C | 3261,2 °F
Sulamislämpö
8,6 kJ/mol
Höyrystymislämpö
175 kJ/mol
Ominaislämpökapasiteetti
0,197 J/g·K
Esiintyvyys maankuoressa
0,0006%
Esiintyvyys maailmankaikkeudessa
5×10-7%
CAS-numero
7440-19-9
PubChem CID-numero
23951
Atomiominaisuudet
Atomisäde
180 pm
Kovalenttisäde
198 pm
Elektronegatiivisuus
1,17 (Paulingin asteikko)
Ionisoitumispotentiaali
5,6437 eV
Moolitilavuus
20,0 cm3/mol
Lämmönjohtavuus
0,133 W/cm·K
Hapetusluvut
2, 3
Käyttö
Samarium's main use is in samarium-cobalt alloy magnets for headphones, small motors and pickups for some electric guitars.
Radioactive samarium-153 is used to kill cancer cells in the treatment of lung cancer, prostate cancer, breast cancer and osteosarcoma.
Samarium and its compounds are also used as catalyst and chemical reagent.
Radioactive samarium-153 is used to kill cancer cells in the treatment of lung cancer, prostate cancer, breast cancer and osteosarcoma.
Samarium and its compounds are also used as catalyst and chemical reagent.
Samarium is considered to be moderately toxic
Isotooppi
Vakaat isotoopit
144Sm, 149Sm, 150Sm, 152Sm, 154SmEpävakaat isotoopit
128Sm, 129Sm, 130Sm, 131Sm, 132Sm, 133Sm, 134Sm, 135Sm, 136Sm, 137Sm, 138Sm, 139Sm, 140Sm, 141Sm, 142Sm, 143Sm, 145Sm, 146Sm, 147Sm, 148Sm, 151Sm, 153Sm, 155Sm, 156Sm, 157Sm, 158Sm, 159Sm, 160Sm, 161Sm, 162Sm, 163Sm, 164Sm, 165Sm